Bachy Soletanche conducts another project for Liverpool’s
dockside regeneration
 Having
completed several highly successful projects in the area, Bachy
Soletanche Limited has now clocked up another, completing its
on-going work at Liverpool’s regenerated dockside. The project,
which saw Bachy Soletanche’s red rigs on the Liverpool waterfront
near the Pier Head, is for the residential development, Mann Island
Mixed Use Development. Bachy Soletanche constructed a secant wall
and bearing piles in a comprehensive piling project.
With one of the best locations in Liverpool City Centre – next to
the ‘Three Graces’, Royal Liver Building, the Cunard Building and
the green-domed Port of Liverpool Building – the Mann Island
Development is set to become a popular living location for
professionals in the city. Moreover, it will provide stunning views
of the River Mersey and the city itself.
The main contractor, HBG Construction awarded Bachy Soletanche the
piling contract with confidence due to the large amount of piling
works the leading geotechnical firm had conducted across the
Liverpool dockside previously. Such projects included the Echo Arena
and BT Conference Centre (Kings Waterfront), two new hotels, a
multi-storey car park and a residential development at Half Tide
Dock.
Steve Mallinson has been the Contract Manager for all these
Liverpool projects and he explained:
“We are now very used to the ground profile of the Liverpool
waterfront which mainly comes from the amount of trial piles and
different rigs and equipment we used at the Kings Waterfront
development. This has stood us in good stead for the projects that
followed.
The ground profile at Mann Island is no different, and we were
especially confident of this when we conducted the piling works for
the Museum of Liverpool – a project next to the Mann Island Mixed
Use development.”
For the project, Bachy Soletanche constructed a firm/hard secant
piled wall and bearing piles which was split into two main sections.
The secant was constructed from November until the end of February
and was then excavated ready for the bearing pile works to begin in
April.
The secant piled wall comprises 604no. 750mm diameter Continuous
Flight Auger (CFA) piles, which covers the perimeter of the site to
create a 363 linear metre secant piled wall. Due to the ground
conditions on site, which has naturally high water content, the
secant wall is Firm/Hard. To construct a Firm/Hard secant wall
structure – and to make the wall as watertight as possible – Bachy
Soletanche is using ‘firm’ or weaker concrete in conjunction with
reinforced concrete piles.
To construct the secant wall, the female piles are installed first
through a guide wall. These are cast with the firm concrete and
drilled right down to the sandstone and left for two or three days
to set. The male piles then bite into the female piles to make a
solid wall structure.
It is the male piles which hold the weight of the structure and
therefore steel reinforcement is incorporated into the full length
of these piles. The male piles are constructed to depths between 11m
and 14m and the female piles go to depths ranging from 7.5m to 14m.
With the male and female piles installed, the wall is then capped by
breaking the tops off the piles and casting a capping beam – a
reinforced concrete beam which links all the individual piles
together.
Steve Mallinson continued:
“We did face a few challenges on site. In the design process we
discovered that an old dock wall ran across part of the site. We
knew we would eventually have to drill through the wall, but this
actually proved quite straightforward due to the heavy-duty rig we
utilised.
Also, when we began to construct the guide wall trench we discovered
a shaft leading to the Queensway tunnel which provided ventilation
during its original construction. The shaft is backfilled, but also
falls directly in line with the secant wall. At this point we
changed the design so that the pile line moved to go around the
shaft wall.”
Although Bachy Soletanche faced these challenges, the ground
engineering firm completed the first section well within its time
specification. Throughout April, Bachy Soletanche was back on site
to work within the secant wall excavation 6m below existing ground.
This was part of the second stage of the project where Bachy
Soletanche constructed 191no. 750mm bearing piles to carry the super
structure. This part of the project completed at the end of April.
Email:
fiona@manifestcomms.co.uk
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